Loop \Loop\, n. [Cf. Ir. & Gael. lub loop, noose, fold, thong,
bend, lub to bend, incline.]
1. A fold or doubling of a thread, cord, rope, etc., through
which another thread, cord, etc., can be passed, or which
a hook can be hooked into; an eye, as of metal; a staple;
a noose; a bight.
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That the probation bear no hinge, nor loop
To hang a doubt on. --Shak.
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2. A small, narrow opening; a loophole.
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And stop all sight-holes, every loop from whence
The eye of Reason may pry in upon us. --Shak.
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3. A curve of any kind in the form of a loop.
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4. (Telegraphy) A wire forming part of a main circuit and
returning to the point from which it starts.
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5. (Acoustics) The portion of a vibrating string, air column,
etc., between two nodes; -- called also ventral segment.
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Loop knot, a single knot tied in a doubled cord, etc. so as
to leave a loop beyond the knot. See Illust. of Knot.
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